Millbank Tower is a 118-metre (387 ft) high skyscraper in the City of Westminster at Millbank, by the River Thames in London. The tower was constructed in 1963, and has been home to many high-profile political organisations, including the Labour and Conservative parties, and the United Nations.

The 2003 edition of the Pevsner architectural guide says that the Millbank Tower is "one of the few London office towers to have won affection", and contrasts it with the "boxy structure" of the Shell Tower at Waterloo.

Throughout its history, the Millbank Tower has been home to many high-profile political and other organisations. From 1994 to 2002 the Labour Party rented two floors in the base at the south of the site, for use as a general election campaign centre. Labour ran its 1997 General Election campaign from these offices; after the election, the party vacated its headquarters at John Smith House, Walworth Road SE17, to move to Millbank. Just five years later, however, the £1 million per annum rent forced the party to vacate the tower and take out a mortgage of £5.5 million to relocate to 16-18 Old Queen Street, overlooking St James's Park, which had 11,200 square feet of open plan premises.[3]

The tower featured in the 1973 film, The Vault of Horror, in which several characters are trapped in a lift in the building. It was also used for the location filming of the Doctor Who serials The Invasion (as the London offices of International Electromatics) and Terror of the Zygons (as the venue for the World Energy Conference).[6] The tower also featured in The Persuaders! episode "Someone Like Me" (1971), in which Danny Wilde (Tony Curtis) is seen going into the building to stop Lord Brett Sinclair (Sir Roger Moore) who has been programmed to shoot his friend Sam Milford (Bernard Lee). In 2010 the building was surrounded and invaded by a large student protest called by the National Union of Students which was campaigning against the Coalition governments increase of tuition fees.